Mounting for shuttle-operating levers



-fizdewiar-x H. E. SMALLBONE.

APPLICATION FILED MAY 15, 1919.

Patented Aug. 10, 1920.

MOUNTING FOR SHUTTLE OPERATING LEVERS.

UNITED STATES PATENT OFFICE.

HARRY E. SMALLBONE, OF BUFFALO, NEW YORK, ASSIGNOR TO KING- SEWINGMACHINE COMFANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

MOUNTING FOR SHUTTLE-OPERATING LEVERS.

To all whom it may concern Be it known that I, HARRY E. SMALLBONE, acitizen of the United States, residing at Buffalo, county of Erie, Stateof New York, have invented a certain new and useful 1mprovement inMountings for Shuttle- Operating Levers, and declare the following to bea full, clear, and exact description of the same, such as will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, which form a part ofthis specification.

A common form of actuating means for reciprocating shuttles in sewingmachines is a U-shaped lever one of the arms of which is long enough toextend the entire length of the sewing machine head while a connectingportion stands in an upright position in the hollow vertical portion ofthe arm. It is essential that the shuttle be securely supported so asalways to remain at a predetermined distance from the under side of thethroat plate; and the shuttlesupporting lever should therefore bemounted in such a way that it may be accurately adjusted and securelyheld in position. Accurate adjustment may be secured by means of upperand lower alined conical bearings which are themselves adjustable fromand toward each other. The bearings must of necessity be in the vicinityof the vertical part of the lever so that the free end of the long armwhich carries the shuttle lies at a distance from the lower bearingpractically equal to the length of the head. As a result, unless thelever is made very strong, and therefore heavy, it is comparatively easyfor the lever to spring and be lifted slightly from its lower bearing;thus dislocating the shuttle in the vertical direction. The object ofthe present invention is so to mount a lever of the character describedthat it will be held upon its lower bearing without being made heavy andcumbersome.

The various features of novelty whereby my invention is characterizedwill hereinafter be pointed out with particularity in the claims; but,for a full understanding of my invention and of its object andadvantages, reference may be had to the following detailed descriptiontaken in connection with the accompanying drawing, wherein:

Figure l is a vertical section through one Specification of LettersPatent.

Patented Aug. 10, 1920. Serial No. 297,272.

end of a sewing machine head containing a shuttle-operating levermounted in accordance with my invention; and

Fig. 2 is a section taken approximately on line 2 '2 of Fig. 1,illustrating only the lower portion ofthe head.

eferring to the drawing, 1 represents the upright portion of the arm ofthe sewing machine head, across the upper end of which extends thehorizontal crank shaft, 2. The shuttle-operating lever comprises anupper horizontal arm, 3, a lower horizontal arm, 4:, anda verticalportion, 5, lying within the part 1. The upper arm of the lever issuitably engaged with the crank shaft so as to oscillate the lever abouta vertical axis. In order to support the lever so as to permit it so tooscillate, there is an upper conical bearing, 6, engaging with the freeend of the arm 3 of the lever, and a lower conical bearing, 7 engagingwith the arm 4. The member 7 is preferably in the form of a plug screwedinto a supporting bracket, 80, so that it may be adjusted up and down.Passing axially through the member 7 is a stud or bolt, *8, having atits lower end a head, 9. At a point above the upper end of the bearing.7 there is a set screw, 10, carried by the arm 4 of'the lever andengaging with the upper end of the bolt or stud and thus, as it were,tying the arm 4 down upon the conical bearing, since the head on thelower end of the stud or bolt will prevent the arm 4 from movingupwardly off of the bearing. By employing a set screw, instead of somemeans which tend to draw the arm down upon the bearing, there is nodanger of interfering with the adjustment of the bearing after it hasonce been made, because the stud or bolt and the cooperating set screwserve simply to fasten the parts in any adjusted position into whichthey may he brought and can serve only the intended purpose ofpreventing the lever from rising more or less from the lower bearing.

While I have illustrated and described with particularity only a singlepreferred form of my invention, I do not desire to be limited to theexact structural details thus illustrated and described; but intend tocover all forms and arrangements which come with in the terms employedin the definitions of my invention constituting the appended claims.

I claim:

1. In combination with a sl'1uttle-operating lever comprising an upperhorizontalarm connecting member between corresponding ends of said arms;an' upper pivotal bearing bearing to hold saidlever against upward.

movement thereon.

2. The combination with a shuttle-operate arm, a long horizontal lower,arm, and an upright connecting member between correspondi'ng ends ofsaid% arms;. an upper pivotal bearing n the v1c1n1ty of theiree endofthe upperarm; a .statlonaryv support; a

lower pivotal bearing mounted, in saidsup port in axial alinement withthe upper bearmg and servmgiboth to. sustain. the weight a lowerhorizontal arm, and an upright arm,

mg lever comprising; a horizontal upper of the lever and as a pivotalcenter, a stud passing axially through said lower pivotal bearing andhaving'a head at its lower end, and a set screw securing the upper endof said stud to the lower arm of saidlever.

3. The"combination with a shuttle-operating lever comprising ahorizontal upper ahorizontal longer lower arm; and an upright connectingmember between corresponding ends of said arms; an upper pivotal bearingin the vicinity ot the free end of theupper arm; a stationary supportbelow said: lower arm; a lower pivotal, bearing member mounted in saidsupport below said alinementwith saidlower arm and in axial upperbearing member s0 as to.- be adjustable in. the vertical. direction; anda tie member extendingbetween: said. lower bearing memher. and saidlower armto hold the arm upon said bearing member.

In testimony whereof I sign this specification.v

HARRY E. SMALLB'ON'E.

